1 A projectile is fired from a gun near the surface of Earth. The initial velocity of the projectile has a vertical component of 98 meters per second and a horizontal component of 49 meters per second. How long will it take the projectile to reach the highest point in its path?

(1) 5.0 s       (3) 20. s
(2) 10. s       (4) 100. s

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2 A 70.-kilogram astronaut has a weight of 560 newtons on the surface of planet Alpha. What is the acceleration due to gravity on planet Alpha?

(1) 0.0 m/s2      (3) 9.8 m/s2
(2) 8.0 m/s2      (4) 80. m/s2

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Base your answers to questions 3 and 4 on the diagram and information below.

The diagram shows a student seated on a rotating circular platform, holding a 2.0-kilogram block with a spring scale. The block is 1.2 meters from the center of the platform. The block has a constant speed of 8.0 meters per second. [Frictional forces on the block are negligible.]

3 Which statement best describes the block’s movement as the platform rotates?

(1) Its velocity is directed tangent to the circular path, with an inward
acceleration.
(2) Its velocity is directed tangent to the circular path, with an
outward acceleration.
(3) Its velocity is directed perpendicular to the circular path, with an inward acceleration.
(4) Its velocity is directed perpendicular to the circular path, with an outward acceleration.

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4 The reading on the spring scale is approximately

(1) 20. N       (3) 110 N
(2) 53 N        (4) 130 N

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5 The diagram below shows a horizontal 8.0-newton force applied to a  4.0-kilogram block on a frictionless table.

What is the magnitude of the block’s acceleration?

(1) 0.50 m/s2     (3) 9.8 m/s2
(2) 2.0 m/s2       (4) 32 m/s2

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